linux-kernel - Re: [PATCH net-next] net: mana: Add new device attributes for mana

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Date: Wed, 17 Apr 2024 22:51:35 -0700
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: Zhu Yanjun <yanjun.zhu@...ux.dev>
Cc: Jason Gunthorpe <jgg@...pe.ca>, linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Ajay Sharma <sharmaajay@...rosoft.com>,
	Leon Romanovsky <leon@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	Long Li <longli@...rosoft.com>,
	Michael Kelley <mikelley@...rosoft.com>,
	Shradha Gupta <shradhagupta@...rosoft.com>,
	Yury Norov <yury.norov@...il.com>,
	Konstantin Taranov <kotaranov@...rosoft.com>,
	Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>
Subject: Re: [PATCH net-next] net: mana: Add new device attributes for mana

On Tue, Apr 16, 2024 at 06:27:04AM +0200, Zhu Yanjun wrote:
> ??? 2024/4/15 18:13, Jason Gunthorpe ??????:
> >On Mon, Apr 15, 2024 at 02:49:49AM -0700, Shradha Gupta wrote:
> >>Add new device attributes to view multiport, msix, and adapter MTU
> >>setting for MANA device.
> >>
> >>Signed-off-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
> >>---
> >>  .../net/ethernet/microsoft/mana/gdma_main.c   | 74 +++++++++++++++++++
> >>  include/net/mana/gdma.h                       |  9 +++
> >>  2 files changed, 83 insertions(+)
> >>
> >>diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> >>index 1332db9a08eb..6674a02cff06 100644
> >>--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
> >>+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> >>@@ -1471,6 +1471,65 @@ static bool mana_is_pf(unsigned short dev_id)
> >>  	return dev_id == MANA_PF_DEVICE_ID;
> >>  }
> >>+static ssize_t mana_attr_show(struct device *dev,
> >>+			      struct device_attribute *attr, char *buf)
> >>+{
> >>+	struct pci_dev *pdev = to_pci_dev(dev);
> >>+	struct gdma_context *gc = pci_get_drvdata(pdev);
> >>+	struct mana_context *ac = gc->mana.driver_data;
> >>+
> >>+	if (strcmp(attr->attr.name, "mport") == 0)
> >>+		return snprintf(buf, PAGE_SIZE, "%d\n", ac->num_ports);
> >>+	else if (strcmp(attr->attr.name, "adapter_mtu") == 0)
> >>+		return snprintf(buf, PAGE_SIZE, "%d\n", gc->adapter_mtu);
> >>+	else if (strcmp(attr->attr.name, "msix") == 0)
> >>+		return snprintf(buf, PAGE_SIZE, "%d\n", gc->max_num_msix);
> >>+	else
> >>+		return -EINVAL;
> >>+
> >
> >That is not how sysfs should be implemented at all, please find a
> >good example to copy from. Every attribute should use its own function
> >with the macros to link it into an attributes group and sysfs_emit
> >should be used for printing
> 
> Not sure if this file drivers/infiniband/hw/usnic/usnic_ib_sysfs.c
> is a good example or not.
> 
> Zhu Yanjun
Thanks for the reference, Zhu.
> 
> >
> >Jason